It is characterized by its black iron glaze, and the unique expression is created by the mottled patterns of reddish-brown and gold (kiln change) that appear during firing. These black spots are iron components in the clay that have oxidized, and are a characteristic of good quality found in many Japanese ceramics. It can be used not only as a teacup but also as a shochu cup or a free cup, and it is a ceramic with high water absorption and heat retention. ♣︎ The rim is thinly made, and the bottom is slightly wider than the opening. 2.5cm from the top, it becomes octagonal. Please check the photos. ♦︎ Diameter of opening: approx. 7.5cm ♦︎ Diameter of base: approx. 8cm ♦︎ Height: approx. 9.5cm Thank you for looking.